Just happened

IOI 2018 took place in Japan in September, 2018. More info is available on the official website.

Just happened   IOI 2018 in Japan

IOI 1989

The 1st International Olympiad in Informatics was held in Pravetz, Bulgaria, from May 16-19, 1989. Six problems were presented to the jury of the event. The first problem (shown below as "Problem 1") was selected for the competition.

Problems:
      Problem 1
      Problem 2
      Problem 3
      Problem 4
      Problem 5
      Problem 6

Note that the grading model changed at IOI'94 and beyond.
Before IOI 1994, a human evaluator would sit behind the competitor's computer and do the testing manually (enter test data through the keyboard, check the output on the screen). Starting from IOI 1994, an automatic grading process is used, with test input defined in files.

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Beginners

Not sure where to go? Click here to view some basic information on how to learn programming and prepare to win a medal at the IOI.

Statistics

A couple of volunteers maintain a separate page with stats about people who participated at the International Olympiad in Informatics.

Journal

The IOI publishes a journal every year, with original high-quality scientific papers related to education, contests and algorithms.